本文解决了一个常见的OpenSSL读取RSA公钥文件时遇到的问题，详细阐述了如何去除BEGIN和END中的RSA关键字以使公钥能被正确加载。
xxxx.pem
-----BEGIN RSA PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA2nOHd1wHuFXK4Zpxwl2s
QRg//CF6w9DdgYhhuW3XHj8PUaedqaG842WdTm5vFKp9F9+Gga3kgleEiBiqtzXA
7cLPXorCHnyHQY1H+9OAuJWkV/blqS05v9KslfdIMveJIIqBNjzBiDdqKhZfJ1V+
IxUaFyQO7jzz1SZG0QAkBq0hfuatvEDRqFP0QUag2fZjgJWDHHWEIkEGgZLPnBa1
w4U4kvYXU+YdN8+LnGlFFqiPOEGidcSj3AcVb5x3gsFL5f8ewiyrGR8TU7TCO0d2
jSJU127EClsmudFdi6kt0mLzYTItKAozTPtZk1GBR+n/2vmB8U12rJe4iRZ5a2hf
/wIDAQAB
-----END RSA PUBLIC KEY-----
执行
openssl rsa -pubin -in xxxx.pem -modulus -noout
返回
unable to load Public Key
4599055980:error:09FFF06C:PEM routines:CRYPTO_internal:no start line:/BuildRoot/Library/Caches/com.apple.xbs/Sources/libressl/libressl-22.260.1/libressl-2.6/crypto/pem/pem_lib.c:683:Expecting: PUBLIC KEY
需要去掉 BEGIN和END中的RSA
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